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        Allocate standard/raw pages

        Entry:
          AH = 5Ah
          AL = subfunction
                00h allocate standard pages
                01h allocate raw pages
          BX = number of pages to allocate
        Return:
          DX = handle
          AH = status
            00h successful
            80h internal error
            81h hardware failure
            84h undefined function requested
            85h no more handles available
            87h insufficient memory pages in system
            88h insufficient memory pages available
            8Fh undefined subfunction